Well, I had my mind set on installing VMware and configuring a few virtual machines. So, I went ahead and downloaded the latest version of VMware server. After a long wait, to my disappointment, it wouldn't install! It doesn't look like VMWare supports Vista x64 as the host. Oh well, forget it!
After seeing a demo of VirtualBox during the Java Developer Day conference a few days ago, I decided to try it out. If it's as good as they claim, then maybe this could be my answer? And true enough, it supports Vista x64 as a host and it pretty much supports all operating systems as a guest. (Except OSX, I think. Hmm... we'll see about that. *wink*)
So, I suggest you give it a try as an alternative to VMware. It's working well for me so far. Here is the link.
Hmm... after giving it a good test, I don't think I'm very happy with VirtualBox. Switching from gui mode to text mode on a Linux guest seems to mess up the mouse pointer. A Vista x64 guest caused it to crash. I had to restart my pc to kill the Virtualbox process. And snapshots are so limited in functionality compared to VMware. I might actually give VMware another try. Perhaps I was just doing it wrong the first time. Oh well...